Extruder issue?

Please forgive me if I have posted in the wrong thread. I have upgraded my printer with the Duet WiFi and have had an issue that has had my printer out of commission for a few months. I have gone over the wiki and tried to fix the issue to no avail. My problem is when the printer first starts and has warmed up everything is as it should be, with the exception of one major issue. The extruder runs great for a few seconds then skips, then skips some more, then goes haywire rotating back and forth without advancing. Things I have tried… I have tried increasing the voltage, I tried changing the steps per mm/min, I have tried 4 different steppers (note: all the steppers work perfect in my other printer) I have even changed to the other driver port just to encounter the same issue.I have also tried with three different versions of software and still the same.

I am at my wits end and have no idea what the issue is or where it lies. I am assuming it is gcode related within the config but cannot seem to figure it out with creating it from scratch with the config tool or using another config I download from someone else that has a working printer. I am truly baffled and am in need of some help. I have built this printer from scratch and have invested a conciderable amount of money into it and would be so pleased if I could finally get it up and running. I have included my config file if anyone could have a look and see if there is anything I need to fix or if you could steer me in the right direction I would be so very grateful.

leveling-strategy.delta-grid.enable true # The strategy must be enabled in the config, as well as the zprobe module.
leveling-strategy.delta-grid.radius 290 # Radius of the bed, must be specified. This needs to be at least as big as

the maximum printing radius as moves outside of this will not

be compensated for correctly

leveling-strategy.delta-grid.bed_x 280 # Reduced by 0mm for home offset

Do you know what the model number of the motor is, I wonder if a really high inductance could cause this kind of issue.
I have also seen stepper motors behave strangely if you have the stepper motor free like that and with no load on the shaft at some speeds/current settings. Have you tried to install it on the printer yet, even holding the motor firmly to the table might cause it to change.

It sounds like you may have tested it but like Phaedrux said make sure to check for a bad connection and you can try moving the wires around a little to see if you can make it run normally if the wires are put in to a specific bend.

I have done all that you have stated, I originally had it on the machine and recently did this setup to be able to tinker with it while spending time with my family instead of being in my man cave for hours on end where my printer is. I have checked all the connections they are all soldered with new wires and all the motors work perfect on my other printers with no issues. I first noticed this while trying a test print and have had no luck since. I have also tried it on the other extuder driver as well with no luck. This not only happens while printing but when I manually move the extruded with the online and pandue controls as well so slicing configuration is not a cause. I will try to lower the jerk and accell and report back.